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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

harmonic balancer question

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Old Aug 14, 2007 | 08:31 PM
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egmeyer
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harmonic balancer question

Is there a difference in the harmonic balancers from an 83 block (4.9L 300) and a 91? Other than the V belt to Serpentine. I recently swapped blocks and used the 93 harmonic balancer on the 91 block. The problem is the timing marks don't align. My concern is a weight/balance issue that may mess up the new crank. Please help!!
 
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Old Aug 15, 2007 | 12:26 AM
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The 300 is naturally balanced, so the weight should not be an issue. If you can figure out the timing mark thing, it may be as simple as getting the later model bracket for the scale and bolting it in place. Or you can measure the diameter of the balancer, and then go to summitracing or jegs and get a timing tape. You will need to find top dead center for #1 cylinder, and then stick the timing tape on the balancer to line the 0 mark up correctly.
 
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Old Aug 15, 2007 | 05:47 PM
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or change to the other timing cover that has
the pointer to match the balancer
 
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Old Aug 15, 2007 | 08:58 PM
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thanks

You guys are great!! Thanks for the advice. Any advice on a vacuum problem? It seems to not be coming off the manifold. Doesn't seem to be clogged but my entire vacuum system is down.
 
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